How Tesla's flying Roadster works and what the technology is actually useful for

Almost nine years after it was first promised, Tesla has unveiled its new Roadster, a car developed with SpaceX that hung upside down on a ramp, flipped in mid-air and jumped a row of Teslas. We explain the fan suction that holds it upside down, the cold-gas thrusters that let it fly, and how the Roadster got here, from a Lotus-based sports car to a car with a rocket inside. 

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